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1 Lesson Plan #33 Date: Wednesday November 21st, 2012 Class: Geometry Topic: Proving triangles congruent by π. π. π . β π. π. π . HW #33: Aim: How do we prove triangles congruent by π. π. π . β π. π. π .? Objectives: Students will be to prove triangles congruent by π. π. π . β π. π. π . Do Now: 1) PROCEDURE: Write the Aim and Do Now Get students working! Take attendance Give Back HW Collect HW Go over the Do Now Assignment #1: Complete the proof below Statements 1) 2) 3) 4) 5) <π΅ β <πΈ < πΆ β < πΉ Μ Μ Μ Μ π¨πͺ β Μ Μ Μ Μ π«π <π΄ β <π· π«π¨π©πͺ β π«π«π¬π Reasons 1) 2) 3) 4) 5) Theorem: Two triangles are congruent if two angles and a side opposite one of the angles in on triangle are congruent to the corresponding two angles and side of the other [π. π. π . β π. π. π . ] Online Interactive Activity: Letβs see AAS in action http://www.mathopenref.com/congruentaas.html 2 Does Angle Angle Angle work as a way to prove triangles congruent? Online Interactive Activity : Letβs go to this URL and see if Angle Angle Angle works as a way to prove triangles congruent http://www.mathopenref.com/congruentaaa.html Does Angle Side Side works as a way to prove triangles congruent? Online Interactive Activity: Letβs go to the URL and see to see if Angle Side Side works as a way to prove triangles congruent http://www.mathopenref.com/congruentssa.html Assignment #2: Assignment #3: Assignment #4: Given: Μ Μ Μ Μ C is the midpoint of π΅πΈ Μ Μ Μ Μ π΄π΅ β₯ Μ Μ Μ Μ π·πΈ Prove: Ξπ΄π΅πΆ β Ξπ·πΆπΈ Statements 1) 2) 3) 4) 5) 6) 7) Reasons 1) 2) 3) 4) 5) 6) 7) Assignment #5: Sample Test Questions: 1) Which of the following is not a postulate or theorem for congruence of triangles? A) ASA B) SAS C) AAS D) SSA If enough time: Do the HW questions